feat(ilm): relocate hot objects across server pools by GET frequency

Keep NVMe/HDD pool pairs useful without remote tiering: promote objects that
are read often, demote previously moved objects once they go idle, and leave
the feature off until operators set a two-pool topology.

Signed-off-by: mr javad seydi <seydi.birjand@gmail.com>

cmd/config-current.go

@@ -227,7 +227,7 @@ func initHelp() {
 		},
 		config.HelpKV{
 			Key:         config.ILMSubSys,
-			Description: "manage ILM settings for expiration and transition workers",
+			Description: "manage ILM settings for expiration, transition, and access-tier workers",
 			Optional:    true,
 		},
 	}
@@ -704,6 +704,9 @@ func applyDynamicConfigForSubSys(ctx context.Context, objAPI ObjectLayer, s conf
 			if globalExpiryState != nil {
 				globalExpiryState.ResizeWorkers(ilmCfg.ExpirationWorkers)
 			}
+			if globalAccessTierState != nil {
+				globalAccessTierState.UpdateWorkers(ilmCfg.AccessWorkers)
+			}
 			globalILMConfig.update(ilmCfg)
 		}
 	}